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To date the video, titled 'Baby's First LOL', has been watched more than 1.9million times since it was uploaded on April 30.

Many commenters have deemed it 'cute' and 'adorable'.

'I think this could keep me happy for days,' one viewer noted.

Another added: 'If this video doesn't make you laugh, please seek medical help﻿.'

According to scientific studies, laughter truly is contagious.

Research conducted by a team from University College London and published in the Journal of Neuroscience in 2007, found that the brain responds to the sound of laughter and prepares the facial muscles to join in the mirth.

Contagious emotions: Held under the arms and bounced up and down, the infant is the first to start giggling

Intimate moment: Then the tiny tot's father descends into hysterics as the gurgles of joy continue - at one point he is even seen wiping tears from his eyes

Commenting on the findings, Sophie Scott, a neuroscientist who led the study, said: 'It seems that it’s absolutely true that ‘laugh and the whole world laughs with you.

'We’ve known for some time that when we are talking to someone, we often mirror their behavior, copying the words they use and mimicking their gestures.

'Now we’ve shown that the same appears to apply to laughter, too - at least at the level of the brain.'

Ms Scott and her team suggested that contagiousness of positive emotions could be an important social factor, helping to build strong bonds between individuals in a group.